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Method for reclaiming rare noble metals from waste circuit board

A technology for waste circuit boards and rare and precious metals, applied in the direction of improving process efficiency, can solve the problems of incomplete separation and recovery, low recovery rate of palladium, etc., and achieve the effects of high recovery rate, environmental friendliness and simple operation.

Active Publication Date: 2011-09-14
JIANGXI GREEN ECO MFG RESOURCE CYCLE
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  • Abstract
  • Description
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Problems solved by technology

However, the lead-containing by-product Na in this method 2 PbO 3 and aluminum-containing by-product Na 2 AlO 3 , antimony by-product Na 2 SbO 3 It is equal to the mixed crystallization in the same step, which has not been completely separated and recovered
In addition, the method of recovering metallic silver in this method is to obtain electrodeposited silver by electrowinning after dissolving the silver-containing filter residue with nitric acid solution. However, when nitric acid dissolves silver, it also dissolves metallic palladium, which leads to the recovery of palladium during the subsequent recovery of coarse palladium powder. rate is not high

Method used

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Embodiment 1

[0033] A method for recovering rare and precious metals from waste circuit boards, comprising the following steps:

[0034](1) Crushing and electrostatic separation: take waste circuit boards, wash, dry, coarse crush, eddy current sorting, fine crushing and electrostatic separation, remove rubber and plastic materials, and obtain metal enriched body powder.

[0035] (2) Calcination: take the metal-enriched body powder described in step (1), and calcinate at a temperature of 500° C. for 2 hours to obtain a calcined material.

[0036] (3) copper and aluminum are extracted by acid leaching: get the calcined material in the step (2), add 3mol / L sulfuric acid to extract copper and aluminum, adjust the pH value to 1.5, filter and separate the solid and liquid, and obtain the leaching solution containing copper and aluminum and Acid leaching filter residue, the acid leaching filter residue enters step (4).

[0037] Separation of copper and aluminum for the first time: Take the leach...

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Abstract

The invention provides a method for reclaiming rare noble metals from a waste circuit board. The method comprises the following steps of: crushing, performing electrostatic separation, calcining, performing acid leaching, and extracting silver, gold, platinum and palladium respectively. The method can realize maximization of valuable metal resource recycle, can reclaim various rare noble metals respectively, and is high in recovery rate, simple in operation of the reclaiming process, low in energy consumption and environment-friendly.

Description

technical field [0001] The invention relates to the treatment of industrial waste, in particular to a method for recovering rare and precious metals from waste circuit boards. Background technique [0002] With the improvement of people's living standards, the frequency of replacement of various household appliances is getting higher and higher, and the amount of waste circuit boards (PCBs) produced by various waste household appliances is increasing. If these waste circuit boards are directly discarded, it will not only occupy a large amount of land resources, but also cause a waste of valuable metal resources, and various toxic and harmful substances such as polyvinyl chloride and halogenated flame retardants contained in them will have harmful effects on the surrounding environment. produce huge pollution. On the other hand, the electronic components on the circuit board contain precious metals such as gold, palladium, platinum, silver, and rare metals such as tantalum, ...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B1/00C22B3/04C22B11/00C22B13/00C22B15/00C22B21/00C22B30/02
CPCY02P10/20
Inventor 许开华谭翠丽
Owner JIANGXI GREEN ECO MFG RESOURCE CYCLE
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